Air release valve



FIG. 1 is a perspective view of an air release valve showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side elevational view of the control valve as seen from the plane indicated by the line 3-3 in FIG. 5;

FIG. 4 is a left side elevational view thereof, as seen from the plane indicated by the line 4-4 in FIG. 5;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is bottom plan view thereof.

The broken lines shown in the figures are for the purposes of illustrating portions of the air release valve and form no part of the claimed design. 

CLAIM The ornamental design for an air release valve, as shown and described. 